Perhaps you should try some spelling variations:
developing control » developing country, developed control, developing countriesl
information past » information part, information pt, information pack
a communication » la communication, data communication, data communications
control trials » control trial, controlled trials, control variables
20 developing » 2 developing, 10 developing, 24 developing
technology 1 » technology _
past decade » last decade, lost decade, first decade
decade a » decades a, decade _, decade 1
costs 20 » costs 60, costs 2.3, costs 2.1

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology 1 information past decade a communication costs 20 developing control trials.*.